Authors:Jasiuniene, E.; Kaunas University of Technology; LithuaniaCicėnas, V.; Kaunas University of Technology; LithuaniaRudžionis, Z.; Kaunas University of Technology; LithuaniaGrigaliūnas, P.; Kaunas University of Technology; Lithuania

One of the factors, which determine the mechanical properties of the fibre reinforced concrete, is the spatial distribution of fibres. Distribution of fibres in the concrete structure is influenced by the casting conditions. Therefore, determination of the spatial fibre distribution is necessary for evaluation of dependences between the fibre spatial orientation and the rheological properties.
The objective of this work was to determine the spatial distribution of steel fibres in self-compacting concrete. Three different mixtures with different workability properties were selected: low, moderate and high dynamic viscosity mixtures. For estimation of the spatial orientation of fibres in self-compacting concrete post processing method of X-ray computed tomography data is proposed. The developed algorithm detects and extracts fibres from the 3D data and determines the position and orientation of each fibre. The proposed approach enables the determination of the spatial distribution of fibres in self-compacting concrete and reveals the dependencies between the rheological properties and the fibre spatial orientation.
The obtained results show how the rheological properties of self-compacting concrete affect the steel fibre orientation and distribution in different sections of samples.